MIPS: loongson32: Remove regs-clk.h

Since commit c464961 ("clk: loongson1: Remove
the outdated driver"), no one is using regs-clk.h.
Therefore, remove this obsolete header file.

Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: kelvincheung

arch/mips/include/asm/mach-loongson32/loongson1.h

@@ -45,7 +45,6 @@
 #define LS1X_NAND_BASE			0x1fe78000
 #define LS1X_CLK_BASE			0x1fe78030
 
-#include <regs-clk.h>
 #include <regs-mux.h>
 #include <regs-rtc.h>