parisc: Fix initialization of bss on 64-bit firmware

Make sure to load the 64-bit (f-extended) address of BSS
when clearing BSS.

Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/src/parisc/head.S b/src/parisc/head.S
index bde72f5..c5da942 100644
--- a/src/parisc/head.S
+++ b/src/parisc/head.S
@@ -293,8 +293,8 @@
 	.import _bss,data
 	.import _ebss,data
 
-	load32	BOOTADDR(_bss),%r3
-	load32	BOOTADDR(_ebss),%r4
+	load32_firmware	BOOTADDR(_bss),%r3
+	load32_firmware	BOOTADDR(_ebss),%r4
 $bss_loop:
 	cmpb,<<,n %r3,%r4,$bss_loop
 	STREGM	%r0,WORD_LEN(%r3)