use pragma pack around PPTable_t definitions

Avoids warnings about alignment changing when embedded inside of a
packed struct (such as _ATOM_VEGA20_POWERPLAYTABLE) seen with clang 15
on arm64.

reported and compile tested by tb@
sent upstream to amd-gfx list

update drm to linux 6.1.2

new hardware support includes

AMD
Raphael, Ryzen 7000 desktop, gfx1036/GC 10.3.6
Mendocino, Ryzen & Athlon 7020 Series mobile APU, gfx1037/GC 10.3.7
Navi 31, gfx1100 dGPU, GC 11.0.0, Radeon RX 7900 XT/XTX
gfx1101 dGPU
gfx1102 dGPU
gfx1103 APU

Thanks to the OpenBSD Foundation for sponsoring this work.