staging: media: ipu7: remove 'U' suffix from hexadecimal literals

staging: media: ipu7: remove 'U' suffix from hexadecimal literals

The ipu7 driver's TODO specifies that the 'U' suffix should be
removed from hexadecimal values in register definitions.

This patch cleans up the definitions in the header files within the
ipu7 directory to comply with the requirements and improve consistency.

The modification was verified by comparing the disassembly of the
built-in.a archive before and after the change. The MD5 hashes of the
disassembly output remained identical, confirming that this is a
purely cosmetic cleanup with no functional impact on the binary.

Signed-off-by: Lian Xiangyu <lin25001x@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>