BACKPORT: cfi: Move BPF CFI types and helpers to generic code

Instead of duplicating the same code for each architecture, move
the CFI type hash variables for BPF function types and related
helper functions to generic CFI code, and allow architectures to
override the function definitions if needed.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20250801001004.1859976-7-samitolvanen@google.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Bug: 452811419
Change-Id: I877c18f139fb0c16cb6163fd77a6265743875293
(cherry picked from commit f1befc82)
[liwei: fix some conflicts and include <linux/cfi.h> to fix build
 issues for x86]
Signed-off-by: wei li <sirius.liwei@honor.corp-partner.google.com>