x86/split_lock: Restructure the unwieldy switch-case in sld_state_show()

x86/split_lock: Restructure the unwieldy switch-case in sld_state_show()

Split the handling in two parts:

1. handle the sld_state option first

2. handle X86_FEATURE flag-based printing afterwards

This splits the function nicely into two, separate logical things which
are easier to parse and understand.

Also, zap the printing in the disabled case.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://patch.msgid.link/20260226145033.GAaaBduQ0rWXydOkAm@fat_crate.local