rpi: Remove need for first32k.bin

* Thanks go out to Simon Arlott for replacing
  the first32k.bin blob with assembly removing
  the need for first32k.bin hack.
* This assembly is a modified version removing
  the Linux kernel boot args.
* haiku_loader renamed to kernel.img will boot
  on Raspberry Pi directly.

src/system/boot/platform/raspberrypi_arm/entry.S

@@ -1,9 +1,24 @@
 .globl _start
 _start:
+	b boot
 
+.balign 0x20
+boot:
+	mov r0, #0
+	@ Machine ID 3138 (0xC42)
+	mov r1, #66
+	orr r1, r1, #3072
+
+	ldr pc, kern_addr
+
+kern_addr:
+	.word kern
+
+.balign 0x8000, 0
+kern:
 	/* Set up 1MB C Stack Space */
 	mov sp, #0x100000
-
 	mov r4, #0
-	/* Start loader */
+
+	/* Start Haiku loader */
 	b pi_start