staging: axis-fifo: Clean up register and mask definitions

staging: axis-fifo: Clean up register and mask definitions

Improve readability and consistency of hardware register definitions:
- Remove unnecessary leading zeros from register offset values
- Use BIT() macro for single-bit interrupt mask definitions
- Align values and comments for better readability

No functional change.

Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Link: https://patch.msgid.link/20251227212640.3321310-9-ovidiu.panait.oss@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>