porting: rm store_ram_init from nimble_port_run()

The ble_store_ram module is (i) deprecated and (ii) nowhere used in the
NimBLE code base, hence there is no need to intialize it.

porting/nimble/src/nimble_port.c

@@ -32,7 +32,7 @@ void
 nimble_port_init(void)
 {
     void os_msys_init(void);
-    void ble_store_ram_init(void);
+
 #if NIMBLE_CFG_CONTROLLER
     void ble_hci_ram_init(void);
 #endif
@@ -44,9 +44,6 @@ nimble_port_init(void)
 
     ble_hs_init();
 
-    /* XXX Need to have template for store */
-    ble_store_ram_init();
-
 #if NIMBLE_CFG_CONTROLLER
     hal_timer_init(5, NULL);
     os_cputime_init(32768);