parisc: Re-use toc_stack as hpmc_stack

No need to have an own hpmc_stack. Just re-use the toc_stack of the
monarch CPU as either a TOC or a HPMC will happen at the same time.
This reduces the kernel memory footprint by 16k.
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/hpmc.S

@@ -43,10 +43,8 @@
 	 * IODC requires 7K byte stack.  That leaves 1K byte for os_hpmc.
 	 */
 
-	__PAGE_ALIGNED_BSS
-	.align 4096
-hpmc_stack:
-	.block 16384
+	.import toc_stack,data
+#define hpmc_stack	toc_stack	/* re-use the TOC stack */
 
 #define HPMC_IODC_BUF_SIZE 0x8000