feat(tc0): add bootargs node

We will maintain the kernel command line here instead of in U-Boot.
Signed-off-by: Anders Dellien <anders.dellien@arm.com>
Change-Id: I6011306cbaf47717c061f542e180005281695516

fdts/tc0.dts

@@ -17,6 +17,7 @@
 	};
 
 	chosen {
+		bootargs = "console=ttyAMA0 debug user_debug=31 earlycon=pl011,0x7ff80000 loglevel=9 androidboot.hardware=total_compute androidboot.boot_devices=1c050000.mmci ip=dhcp androidboot.selinux=permissive allow_mismatched_32bit_el0";
 		stdout-path = "serial0:115200n8";
 	};