Finish converting CONFIG_SYS_CACHELINE_SIZE to Kconfig

We move the SYS_CACHE_SHIFT_N options from arch/arm/Kconfig to
arch/Kconfig, and introduce SYS_CACHE_SHIFT_4 to provide a size of 16.
Introduce select statements for other architectures based on current
usage.  For MIPS, we take the existing arch-specific symbol and migrate
to the generic symbol.  This lets us remove a little bit of otherwise
unused code.

Cc: Alexey Brodkin <alexey.brodkin@synopsys.com>
Cc: Anup Patel <anup.patel@wdc.com>
Cc: Atish Patra <atish.patra@wdc.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Leo <ycliang@andestech.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/arch/mips/mach-mtmips/Kconfig b/arch/mips/mach-mtmips/Kconfig
index 8756cadb..747988a 100644
--- a/arch/mips/mach-mtmips/Kconfig
+++ b/arch/mips/mach-mtmips/Kconfig
@@ -39,7 +39,7 @@
 
 config SOC_MT7620
 	bool "MT7620"
-	select MIPS_L1_CACHE_SHIFT_5
+	select SYS_CACHE_SHIFT_5
 	select SYS_MIPS_CACHE_INIT_RAM_LOAD
 	select PINCTRL_MT7620
 	select MT7620_SERIAL
@@ -54,7 +54,7 @@
 
 config SOC_MT7628
 	bool "MT7628"
-	select MIPS_L1_CACHE_SHIFT_5
+	select SYS_CACHE_SHIFT_5
 	select MIPS_INIT_STACK_IN_SRAM
 	select MIPS_SRAM_INIT
 	select SYS_MIPS_CACHE_INIT_RAM_LOAD