Merge tag 'xilinx-v2021.1' of https://github.com/Xilinx/linux-xlnx.git

These drivers were kept as is. Meaning that the incoming changes were
not accepted:
 1. drivers/gpio/gpio-xilinx.c
    Reason: commit 408c13c ("gpio: xilinx: Restore upstream version")
 2. drivers/usb/phy/phy-ulpi.c.
    Reason: commit c426e12 ("Revert "usb: phy: Add platform driver support for ULPI phys")

This is a list of fixes (some straight ones are not mentioned) needed
after resolving the merge conflicts to have linux compiling:

 * Removed the ---help--- syntax in Kconfig (not supported anymore);
 * Remove dependency on VIDEO_V4L2_SUBDEV_API for VIDEO_AXI_HDMI_RX and
   VIDEO_IMAGEON_BRIDGE as they select VIDEO_ADV7604 which already selects
   VIDEO_V4L2_SUBDEV_API. This would create a kconfig recursive dependency;
 * The v4l2 VIDEO_ADV7511 driver cannot be enabled at the same time as the
   DRM driver. Otherwise kconfig will complain (as such
   VIDEO_IMAGEON_BRIDGE is removed from the defconfig):
   "WARNING: unmet direct dependencies detected for VIDEO_ADV7511
      Depends on [n]: MEDIA_SUPPORT [=y] && VIDEO_V4L2 [=y] &&
    I2C [=y] && (DRM_I2C_ADV7511 [=y]=n || COMPILE_TEST [=n])
      Selected by [y]:
      - VIDEO_IMAGEON_BRIDGE [=y] && MEDIA_PLATFORM_SUPPORT [=y] &&
    V4L_PLATFORM_DRIVERS [=y] && MEDIA_SUPPORT [=y] && VIDEO_V4L2 [=y] &&
    I2C [=y] && (GPIOLIB [=y] || COMPILE_TEST [=n])

    WARNING: unmet direct dependencies detected for VIDEO_ADV7511
      Depends on [n]: MEDIA_SUPPORT [=y] && VIDEO_V4L2 [=y] && I2C [=y] &&
    (DRM_I2C_ADV7511 [=y]=n || COMPILE_TEST [=n])
      Selected by [y]:
      - VIDEO_IMAGEON_BRIDGE [=y] && MEDIA_PLATFORM_SUPPORT [=y] &&
    V4L_PLATFORM_DRIVERS [=y] && MEDIA_SUPPORT [=y] && VIDEO_V4L2 [=y] &&
   I2C [=y] && (GPIOLIB [=y] || COMPILE_TEST [=n])".
 * Remove dma-contiguous.h (not present anymore) from mw_stream_channel.h;
 * Remove drmP.h from axi_hdmi_drv.c;
 * Replace gem_open_object (dropped upstream) by gem_open_object_unlocked.
 * Include drm/drm_bridge.h on the encoder
 * Add flags argument to 'drm_bridge_attach()'. The flags value is 0 to
   keep the same functionality as before. Though we might want to double
   check this we can (most likely) pass 'DRM_BRIDGE_ATTACH_NO_CONNECTOR';
 * Fix adrv9363x_box() by using the 'asoc_rtd_to_{codec|cpu}' helpers;
 * axi-hdmi-rx replace VFL_TYPE_GRABBER by VFL_TYPE_VIDEO
   (renamed upstream);
 * Handle removal of 'iio_priv_to_dev()'. A pointer to the iio_dev is used
   in the state struct;
 * Convert pwm_state period and duty cylce to u64 to be compliant with
   upstream. It also fixes a lot of warnings;
 * Replace removed 'dev->dma_pfn_offset' by new 'dma_range_map' in
   mathworks driver;
 * Replace removed 'dma_request_slave_channel_reason()' with
   'dma_request_chan()' in mathworks driver;