kms_cursor_crc: Remove some test cases and change cursor to color

kms_cursor_crc: Remove some test cases and change cursor to color

Currently this test is quite useless, since it only checks for valid CRCs when
the correct output from a test is a completely black screen (invisible or visible
but black cursor, or cursor is offscreen) and disables the check when anything
visible is onscreen.

This patch changes the cursor to a colorful one and removes the test cases
that become redundant because of this change. The cursor is designed to be
asymmetrical such that future tests involving rotation, mirroring, etc. produce
different CRCs and failures can be detected.

This (temporarily) disables CRC testing until the next patch which will add
software rendering of the cursor and the CRC generation.

Signed-off-by: Antti Koskipaa <antti.koskipaa@linux.intel.com>