MIPS: tlbex: Remove some RIXI redundancy

MIPS: tlbex: Remove some RIXI redundancy

The cpu_has_rixi cases in build_update_entries are now identical to the
non-RIXI cases with the one exception of the r45k_bvahwbug case which is
hardcoded as never happening anyway & presumably was either missed from
the RIXI path or would never happen on a CPU with RIXI support. Remove
the redundant checks & duplication.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Steven J. Hill <[email protected]>
Cc: Leonid Yegoshin <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: [email protected]
Cc: James Hogan <[email protected]>
Cc: Markos Chandras <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/11215/
Signed-off-by: Ralf Baechle <[email protected]>