Move from 'hello.c' to 'start_kernel.c' to sound more professional...

...though at this point start_kernel.c just does a test of the video and
serial/printing capabilities and nothing else.

kernel/start_kernel.c

@@ -0,0 +1,28 @@
+#include <print.h>
+#include <devices/pl011.h>
+
+#include <devices/pl110.h>
+#include <framebuffer.h>
+
+struct fb myfb;
+
+void video(void)
+{
+	unsigned int x, y;
+	pl110_init(&myfb, 16);
+	x = 0, y = 0;
+	for (x=0; x<640; x++)
+		for (y=0; y<480; y++)
+			fb_write_pixel(&myfb, x, y, 0x1f, 0x1f, 0x0);
+
+}
+ 
+int main(void)
+{
+	print_init(&pl011_putc); //initialize the serial console
+
+	video();
+
+	print("hello, world!\n");
+	return 0;
+}