gralloc4-vts: Remove assert for sizeInBits for RAW formats

sizeInBits for components in RAW formats do not have to be invalid even if the bits are not contiguous.

Bug: 265348037
Test: atest VtsHalGraphicsMapperV4_0TargetTest

Change-Id: I69f58226e988c20b8ba5499ffec4fa0e2b2a68df
Signed-off-by: Devika Krishnadas <kdevika@google.com>