x86/kexec: Consolidate relocate_kernel() function parameters

During kexec, the kernel jumps to the new kernel in relocate_kernel(),
which is implemented in assembly and both 32-bit and 64-bit have their
own version.

Currently, for both 32-bit and 64-bit, the last two parameters of the
relocate_kernel() are both 'unsigned int' but actually they only convey
a boolean, i.e., one bit information.  The 'unsigned int' has enough
space to carry two bits information therefore there's no need to pass
the two booleans in two separate 'unsigned int'.

Consolidate the last two function parameters of relocate_kernel() into a
single 'unsigned int' and pass flags instead.

Only consolidate the 64-bit version albeit the similar optimization can
be done for the 32-bit version too.  Don't bother changing the 32-bit
version while it is working (since assembly code change is required).

Signed-off-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/all/20250901160930.1785244-2-pbonzini%40redhat.com

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