davinci: make arch_idle and arch_reset as inline functions

Make arch_idle and arch_reset inline as inline function.

Not having them inline leads to a warning of this sort when only
one of these functions is used:

arch/arm/mach-davinci/include/mach/system.h:24: warning: 'arch_reset' \
defined but not used

boot, re-boot tested on OMAP-L138 EVM
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/include/mach/system.h

@@ -16,12 +16,12 @@
 
 extern void davinci_watchdog_reset(void);
 
-static void arch_idle(void)
+static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
 
-static void arch_reset(char mode, const char *cmd)
+static inline void arch_reset(char mode, const char *cmd)
 {
 	davinci_watchdog_reset();
 }