Use (std) bool instead of custom bool types

OAI is riddled with boolean_t, FALSE, TRUE, etc. This makes no sense, as
there is a standard bool type, and could lead to nasty bugs if a
definition of a bool is non-standard (0 == false, true == !false). This
commit removes all non-standard bools in the whole project.

targets/ARCH/COMMON/common_lib.h

@@ -380,7 +380,7 @@ struct openair0_device_t {
       @param buff Buffer which holds the samples (2 dimensional)
       @param nsamps number of samples to be sent
       @param number of antennas 
-      @param flags flags must be set to TRUE if timestamp parameter needs to be applied
+      @param flags flags must be set to true if timestamp parameter needs to be applied
   */
   int (*trx_write_func)(openair0_device *device, openair0_timestamp timestamp, void **buff, int nsamps,int antenna_id, int flags);
 
@@ -390,7 +390,7 @@ struct openair0_device_t {
       @param buff Buffer which holds the samples (1 dimensional)
       @param nsamps number of samples to be sent
       @param antenna_id index of the antenna if the device has multiple anteannas
-      @param flags flags must be set to TRUE if timestamp parameter needs to be applied
+      @param flags flags must be set to true if timestamp parameter needs to be applied
   */
   int (*trx_write_func2)(openair0_device *device, openair0_timestamp timestamp, void *buff, int nsamps,int antenna_id, int flags);