tests/kms_cursor_crc.c: Improve test_cursor_alpha()

In the kms_cursor_crc, the subtest to check exterme alpha values failed due
to different CRCs observed in hardware and software rendering. This patch fixes
CRC mismatch error in cursor-alpha-opaque and cursor-alpha-transparent subtests
by improving the order in which cursor was rendered in hardware test. Changes
made in test_cursor_alpha() to ensure cursor rendering in hardware test and
acquire CRC value:
- Add drmModeSetCursor() to set cursor image.
- Remove igt_display_commit() to reduce the chance of getting crc values cleared
  before it is acquired.
- Add igt_remove_fb() to remove locally created framebuffer after disabling the
  cursor plane in HW test

  Also, aligned this function with test_cursor_size and after these changes
  got passing results for alpha blending support added in VKMS CRC API.

Signed-off-by: Mamta Shukla <mamtashukla555@gmail.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109350

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