MIPS: pic32mzda: Fix linker error for pic32_get_pbclk()

Early clock API pic32_get_pbclk() is defined in early_clk.c and used by
time.c and early_console.c. When CONFIG_EARLY_PRINTK isn't set,
early_clk.c isn't compiled and time.c fails to link.

Fix it by compiling early_clk.c always. Also sort files in alphabetical
order.

Fixes: 6e4ad1b41360 ("MIPS: pic32mzda: fix getting timer clock rate.")
Reported-by: Harvey Hunt <[e-mail]>
Signed-off-by: Purna Chandra Mandal <[e-mail]>
Reviewed-by: Harvey Hunt <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Cc: Joshua Henderson <[e-mail]>
Cc: [e-mail]
Cc: <[e-mail]> # 4.7.x-
Patchwork: https://patchwork.linux-mips.org/patch/13383/
Signed-off-by: James Hogan <[e-mail]>

arch/mips/pic32/pic32mzda/Makefile

···
 # Joshua Henderson, <[e-mail]>
 # Copyright (C) 2015 Microchip Technology, Inc.  All rights reserved.
 #
-obj-y			:= init.o time.o config.o
+obj-y			:= config.o early_clk.o init.o time.o
 
 obj-$(CONFIG_EARLY_PRINTK)	+= early_console.o      \
-				   early_pin.o		\
-				   early_clk.o
+				   early_pin.o