QDMA: Resolve build error on recent kernel version

[heeuid]

Descripton

This PR addresses build errors introduced by Kbuild changes and stricter type-checking in Linux kernel 6.15.

Changes

• Kbuild: Switched from EXTRA_CFLAGS to ccflags-y (Fixes missing include paths/macros in v6.15+).
• Bitfields: Resolved FIELD_GET redefinition by using standard <linux/bitfield.h> for v6.15 and above.
• Type Safety: Removed redundant FIELD_GET calls on already-extracted bitfields to fix typeof() validation errors in the latest kernel headers.
• Empty body if statement: Resolve empty-body error

Environment

Tested on: 6.17.0-14-generic (ubuntu 24.04)