sam4e8e: Move the sam4 cache setup to its own sam4_cache.c file

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/sam4e8e/main.c

@@ -43,12 +43,6 @@ int
 main(void)
 {
     SystemInit();
-
-    // Enable Cache
-    if (!(CMCC->CMCC_SR & CMCC_SR_CSTS))
-        CMCC->CMCC_CTRL = CMCC_CTRL_CEN;
-
-    // Start main loop
     sched_main();
     return 0;
 }