drm/amd/display: avoid unaligned access warnings

When building on OpenBSD/arm64 with clang 15, unaligned access
warnings are seen when a union is embedded inside a packed struct.

drm/amd/display/dmub/inc/dmub_cmd.h:941:18: error: field
cursor_copy_src within 'struct dmub_rb_cmd_mall' is less aligned than
'union dmub_addr' and is usually due to 'struct dmub_rb_cmd_mall'
being packed, which can lead to unaligned accesses
[-Werror,-Wunaligned-access]
union dmub_addr cursor_copy_src; /**< Cursor copy address */
^
drm/amd/display/dmub/inc/dmub_cmd.h:942:18: error: field cursor_copy_dst
within 'struct dmub_rb_cmd_mall' is less aligned than
'union dmub_addr' and is usually due to 'struct dmub_rb_cmd_mall'
being packed, which can lead to unaligned accesses
[-Werror,-Wunaligned-access]
union dmub_addr cursor_copy_dst; /**< Cursor copy destination */
^

Add pragma pack around dmub_addr to avoid this.

Signed-off-by: Jonathan Gray <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

···
 #define dmub_udelay(microseconds) udelay(microseconds)
 #endif
 
+#pragma pack(push, 1)
 /**
  * union dmub_addr - DMUB physical/virtual 64-bit address.
  */
···
 	} u; /*<< Low/high bit access */
 	uint64_t quad_part; /*<< 64 bit address */
 };
+#pragma pack(pop)
 
 /**
  * Dirty rect definition.