Kernel: Add a kernel boot parameter to force PIO mode

Also added an option in the run script to force PIO operation mode with
the IDE controller.
In addition, we're no longer limited to PIIX3 and PIIX4 chipsets for DMA

Kernel/run

@@ -51,13 +51,18 @@ elif [ "$1" = "qgrub" ]; then
         $SERENITY_PACKET_LOGGING_ARG \
         -netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
         -device e1000,netdev=breh
-elif [ "$1" = "qtext" ]; then
-    # ./run: qemu with serenity in text mode
+elif [ "$1" = "qcmd" ]; then
+    SERENITY_KERNEL_CMDLINE=""
+    for (( i=2; i<=$#; i++)); do
+        SERENITY_KERNEL_CMDLINE+="${!i} "
+    done
+    echo "Starting SerenityOS, Commandline: ${SERENITY_KERNEL_CMDLINE}"
+    # ./run: qemu with serenity with custom commandline
     $SERENITY_QEMU_BIN \
         $SERENITY_COMMON_QEMU_ARGS \
         -device e1000 \
         -kernel kernel \
-        -append "${SERENITY_KERNEL_CMDLINE} text_debug"
+        -append "${SERENITY_KERNEL_CMDLINE}"
 else
     # ./run: qemu with user networking
     $SERENITY_QEMU_BIN \