Remote "static" from MBED_FORCEINLINE

Static keyword causes problems when trying to use force-inlined
functions from normal inlined functions. This is not legal:

    static inline void forced() { }

    inline void normal() { forced(); }

You cannot reference internal-linkage things from external-linkage
inline functions.

Removal of the static implies that in C there would need to be a
non-inline definition in case anyone calls it non-inlined, but if the
force attribute is doing its job, that should not happen.

Only significant in-tree user of the MBED_FORCEINLINE macro is
the atomic operations - making this change permits atomic operations
from non-static inline functions.

Author: kjbracey

components/TARGET_PSA/services/storage/common/psa_storage_common_impl.cpp

@@ -127,7 +127,7 @@ static psa_status_t convert_status(int status)
  * \param n[in] number of bits to shift right
  * \return the result
  */
-MBED_FORCEINLINE uint32_t lsr32(uint32_t x, uint32_t n)
+static MBED_FORCEINLINE uint32_t lsr32(uint32_t x, uint32_t n)
 {
     return x >> n;
 }
@@ -140,7 +140,7 @@ MBED_FORCEINLINE uint32_t lsr32(uint32_t x, uint32_t n)
  * \param n[in] number of bits to shift right
  * \return the result
  */
-MBED_FORCEINLINE uint64_t lsr64(uint64_t x, uint32_t n)
+static MBED_FORCEINLINE uint64_t lsr64(uint64_t x, uint32_t n)
 {
     return x >> n;
 }

platform/mbed_toolchain.h

@@ -277,11 +277,11 @@
  */
 #ifndef MBED_FORCEINLINE
 #if defined(__GNUC__) || defined(__clang__) || defined(__CC_ARM)
-#define MBED_FORCEINLINE static inline __attribute__((always_inline))
+#define MBED_FORCEINLINE inline __attribute__((always_inline))
 #elif defined(__ICCARM__)
-#define MBED_FORCEINLINE _Pragma("inline=forced") static
+#define MBED_FORCEINLINE _Pragma("inline=forced")
 #else
-#define MBED_FORCEINLINE static inline
+#define MBED_FORCEINLINE inline
 #endif
 #endif