intel/isl: Fix map between sRGB and linear formats

intel/isl: Fix map between sRGB and linear formats

Some SRGB formats don't get the expected linear counterparts in
isl_format_srgb_to_linear() in the generated isl_format_layout.c.

The replace() of string in python returns the unchanged input
string when no replacement occurred, so the first rule
('_SRGB', '') returns the original SRGB format name that passes
the following check unintendedly.

Another quirk is needed for a pair of formats not following
the patterns of other formats.

Signed-off-by: Zhang, Jianxun <jianxun.zhang@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22247>