Merge tag 'ffa-fix-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep...

Arm FF-A fix for v6.18

The FF-A driver was updated to support specification version 1.2 but omitted
support for the 16-byte implementation-defined (IMPDEF) field introduced in
FF-A v1.2 within the Endpoint Memory Access Descriptor (EMAD). This omission
breaks all memory interfaces.

This change updates the EMAD sizing and offset logic to correctly handle the
FF-A v1.2 layout while preserving backward compatibility with older versions.

* tag 'ffa-fix-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Add support for IMPDEF value in the memory access descriptor

Signed-off-by: Arnd Bergmann <arnd@arndb.de>