stdlib: don't hide the malloc et all declarations

It doesn't hurt to expose declarations. Instead of
a compile-time error there'll be a link error if someone
tries to malloc() anything.

Change-Id: Ief6f22c168c660a6084558b5889ea4cc42fefdde
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11406
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

src/include/stdlib.h

@@ -20,12 +20,10 @@
 #define min(a,b) MIN((a),(b))
 #define max(a,b) MAX((a),(b))
 
-#if !defined(__PRE_RAM__)
 void *memalign(size_t boundary, size_t size);
 void *malloc(size_t size);
 /* We never free memory */
 static inline void free(void *ptr) {}
-#endif
 
 #ifndef __ROMCC__
 static inline unsigned long div_round_up(unsigned int n, unsigned int d)