MIPS: p5600: Discard UCA config selection

Commit 2a598436 ("MIPS: Drop CPU_SUPPORTS_UNCACHED_ACCELERATED")
removed UCA config, but left the selection unused, delete it.
Signed-off-by: NJinyang He <hejinyang@loongson.cn>
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -1589,7 +1589,6 @@ config CPU_P5600
 	select CPU_SUPPORTS_32BIT_KERNEL
 	select CPU_SUPPORTS_HIGHMEM
 	select CPU_SUPPORTS_MSA
-	select CPU_SUPPORTS_UNCACHED_ACCELERATED
 	select CPU_SUPPORTS_CPUFREQ
 	select CPU_MIPSR2_IRQ_VI
 	select CPU_MIPSR2_IRQ_EI