wifi: remove esp_phy_enable/disable IRAM_attr

esp_phy_enable and esp_phy_disable were declared both with IRAM attr
and with (noflash) in the linker fragment file, causing ldgen to emit
warnings.

Remove IRAM_attr and let the linker fragment decide placement

components/esp_wifi/src/phy_init.c

@@ -195,7 +195,7 @@ IRAM_ATTR void esp_phy_common_clock_disable(void)
     wifi_bt_common_module_disable();
 }
 
-IRAM_ATTR void esp_phy_enable(void)
+void esp_phy_enable(void)
 {
     _lock_acquire(&s_phy_access_lock);
 
@@ -231,7 +231,7 @@ IRAM_ATTR void esp_phy_enable(void)
     _lock_release(&s_phy_access_lock);
 }
 
-IRAM_ATTR void esp_phy_disable(void)
+void esp_phy_disable(void)
 {
     _lock_acquire(&s_phy_access_lock);