Fix build error with optimizations disabled (-O0)

If Trusted Firmware is built with optimizations disabled (-O0), the
linker throws the following error:

    undefined reference to 'xxx'

Where 'xxx' is a raw inline function defined in a header file. The
reason is that, with optimizations disabled, GCC may decide to skip
the inlining. If that is the case, an external definition to the
compilation unit must be provided. Because no external definition
is present, the linker throws the error.

This patch fixes the problem by declaring the following inline
functions static, so the internal definition is used:
 - cm_set_next_context()
 - bakery_lock_init()

Note that building the TF with optimizations disabled when Trusted
Board Boot is enabled is currently unsupported, as this makes the BL2
image too big to fit in memory without any adjustment of its base
address. Similarly, disabling optimizations for debug builds on FVP
is unsupported at the moment.

Change-Id: I284a9f84cc8df96a0c1a52dfe05c9e8544c0cefe

include/common/context_mgmt.h

@@ -55,7 +55,6 @@ void cm_set_context_by_index(unsigned int cpu_idx,
 			     unsigned int security_state);
 void *cm_get_context(uint32_t security_state);
 void cm_set_context(void *context, uint32_t security_state);
-inline void cm_set_next_context(void *context);
 void cm_init_context(uint64_t mpidr,
 		     const struct entry_point_info *ep) __deprecated;
 void cm_init_my_context(const struct entry_point_info *ep);
@@ -80,7 +79,7 @@ uint32_t cm_get_scr_el3(uint32_t security_state);
  * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for
  * the required security state
  ******************************************************************************/
-inline void cm_set_next_context(void *context)
+static inline void cm_set_next_context(void *context)
 {
 #if DEBUG
 	uint64_t sp_mode;

include/lib/bakery_lock.h

@@ -96,7 +96,7 @@ typedef bakery_info_t bakery_lock_t;
 
 #endif /* __USE_COHERENT_MEM__ */
 
-inline void bakery_lock_init(bakery_lock_t *bakery) {}
+static inline void bakery_lock_init(bakery_lock_t *bakery) {}
 void bakery_lock_get(bakery_lock_t *bakery);
 void bakery_lock_release(bakery_lock_t *bakery);