src/lib: Clean up general issues found by checkpatch.pl

Fix the following errors and warnings detected by checkpatch.pl:

ERROR: Bad function definition - void init_timer() should probably be void init_timer(void)
ERROR: Prefixing 0x with decimal output is defective
WARNING: Comparisons should place the constant on the right side of the test
WARNING: char * array declaration might be better as static const

TEST=Build and run on Galileo Gen2

Change-Id: I9f618eea95e1f92fa34f4f89da27c0b16ae7f4ee
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18763
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/lib/timer.c

@@ -18,7 +18,7 @@
 #include <delay.h>
 #include <thread.h>
 
-__attribute__((weak)) void init_timer() { /* do nothing */ }
+__attribute__((weak)) void init_timer(void) { /* do nothing */ }
 
 void udelay(unsigned int usec)
 {