MIPS: Clean up arch/mips/Makefile
MIPS: Clean up arch/mips/Makefile

- Drop CLEAN_FILES assignments that is no longer required
- Add $(Q) in a few rules

Signed-off-by: Sam Ravnborg <f16bed56189e249fe4ca8ed10a1ecae60e8ceac0@ravnborg.org>
To: linux-mips <562397917b9a8bf316569a848858b12fb417723f@linux-mips.org>
To: Wu Zhangjin <0f93e24a900c64af20f0433e44e890fcc03d0233@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/1305/
Signed-off-by: Ralf Baechle <92f48d309cda194c8eda36aa8f9ae28c488fa208@linux-mips.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs