complier.h: add __always_inline and use it in code base

Add a __always_inline macro that wraps __attribute__((always_inline))
and replace current users with the macro, excluding files under
src/vendorcode.

Change-Id: Ic57e474c1d2ca7cc0405ac677869f78a28d3e529
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/28587
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@google.com>

src/cpu/amd/car/disable_cache_as_ram.c

@@ -19,10 +19,11 @@
  * WARNING: this file will be used by both any AP cores and core 0 / node 0
  */
 
+#include <compiler.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/msr.h>
 
-static inline __attribute__((always_inline)) uint32_t amd_fam1x_cpu_family(void)
+static __always_inline uint32_t amd_fam1x_cpu_family(void)
 {
 	uint32_t family;
 
@@ -32,7 +33,7 @@ static inline __attribute__((always_inline)) uint32_t amd_fam1x_cpu_family(void)
 	return family;
 }
 
-static inline __attribute__((always_inline))
+static __always_inline
 void disable_cache_as_ram_real(uint8_t skip_sharedc_config)
 {
 	msr_t msr;

src/cpu/amd/family_10h-family_15h/init_cpus.c

@@ -14,6 +14,7 @@
  * GNU General Public License for more details.
  */
 
+#include <compiler.h>
 #include "init_cpus.h"
 
 #if IS_ENABLED(CONFIG_HAVE_OPTION_TABLE)
@@ -231,7 +232,7 @@ static inline int lapic_remote_read(int apicid, int reg, u32 *pvalue)
 static void init_fidvid_ap(u32 apicid, u32 nodeid, u32 coreid);
 #endif
 
-static inline __attribute__((always_inline))
+static __always_inline
 void print_apicid_nodeid_coreid(u32 apicid, struct node_core_id id,
 				const char *str)
 {

src/cpu/x86/smm/smihandler.c

@@ -60,7 +60,7 @@ void smi_release_lock(void)
 }
 
 #define LAPIC_ID 0xfee00020
-static inline __attribute__((always_inline)) unsigned long nodeid(void)
+static __always_inline unsigned long nodeid(void)
 {
 	return (*((volatile unsigned long *)(LAPIC_ID)) >> 24);
 }