MIPS: Loongson32: Fix config brokenness; select SYS_SUPPORTS_32BIT_KERNEL

Commit a96d68ba ("MIPS: Loongson32: clarify we don't support MIPS16
and merge configs") attempted to reduce duplication in Kconfig by
consolidating some selects common to Loongson 1B & 1C CPUs under
CPU_LOONGSON1. Unfortunately it clearly wasn't tested because by
removing SYS_SUPPORTS_32BIT_KERNEL it prevented 32BIT from being enabled
leading to all sorts of strange build errors from a kernel configured to
build as neither 32 nor 64 bit.

Both loongson1b_defconfig & loongson1c_defconfig failed to build due to
this problem.

Revert the cleanup portions of commit a96d68ba ("MIPS: Loongson32:
clarify we don't support MIPS16 and merge configs"), keeping only its
removal of the selection of SYS_SUPPORTS_MIPS16.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: a96d68ba ("MIPS: Loongson32: clarify we don't support MIPS16 and merge configs")

arch/mips/Kconfig

@@ -1869,10 +1869,6 @@ config CPU_LOONGSON1
 	select CPU_HAS_PREFETCH
 	select CPU_HAS_LOAD_STORE_LR
 	select CPU_SUPPORTS_32BIT_KERNEL
-	select IRQ_MIPS_CPU
-	select DMA_NONCOHERENT
-	select BOOT_ELF32
-	select SYS_SUPPORTS_LITTLE_ENDIAN
 	select CPU_SUPPORTS_HIGHMEM
 	select CPU_SUPPORTS_CPUFREQ
 

arch/mips/loongson32/Kconfig

@@ -9,6 +9,12 @@ config LOONGSON1_LS1B
 	select CEVT_R4K if !MIPS_EXTERNAL_TIMER
 	select CSRC_R4K if !MIPS_EXTERNAL_TIMER
 	select SYS_HAS_CPU_LOONGSON1B
+	select DMA_NONCOHERENT
+	select BOOT_ELF32
+	select IRQ_MIPS_CPU
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_HIGHMEM
 	select SYS_HAS_EARLY_PRINTK
 	select USE_GENERIC_EARLY_PRINTK_8250
 	select COMMON_CLK
@@ -17,6 +23,13 @@ config LOONGSON1_LS1C
 	bool "Loongson LS1C board"
 	select CEVT_R4K if !MIPS_EXTERNAL_TIMER
 	select CSRC_R4K if !MIPS_EXTERNAL_TIMER
+	select SYS_HAS_CPU_LOONGSON1C
+	select DMA_NONCOHERENT
+	select BOOT_ELF32
+	select IRQ_MIPS_CPU
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_HIGHMEM
 	select SYS_HAS_EARLY_PRINTK
 	select USE_GENERIC_EARLY_PRINTK_8250
 	select COMMON_CLK