x86/cacheinfo: Separate Intel CPUID leaf 0x4 handling

init_intel_cacheinfo() was overly complex.  It parsed leaf 0x4 data,
leaf 0x2 data, and performed post-processing, all within one function.
Parent commit moved leaf 0x2 parsing and the post-processing logic into
their own functions.

Continue the refactoring by extracting leaf 0x4 parsing into its own
function.  Initialize local L2/L3 topology ID variables to BAD_APICID by
default, thus ensuring they can be used unconditionally.

Suggested-by: Thomas Gleixner <[email protected]>
Signed-off-by: Ahmed S. Darwish <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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