MIPS: RB532: Remove gpio bootup state

We are no longer using gpio bootup state, so do not export
it and do not parse the kernel command line tag for it.
Instead we provide gpio-keys for the button the gpio bootup
state was checking.
Signed-off-by: NFlorian Fainelli <florian@openwrt.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/rb532/prom.c

@@ -41,8 +41,6 @@ extern void __init setup_serial_port(void);
 
 unsigned int idt_cpu_freq = 132000000;
 EXPORT_SYMBOL(idt_cpu_freq);
-unsigned int gpio_bootup_state;
-EXPORT_SYMBOL(gpio_bootup_state);
 
 static struct resource ddr_reg[] = {
 	{
@@ -108,9 +106,6 @@ void __init prom_setup_cmdline(void)
 				mips_machtype = MACH_MIKROTIK_RB532;
 		}
 
-		if (match_tag(prom_argv[i], GPIO_TAG))
-			gpio_bootup_state = tag2ul(prom_argv[i], GPIO_TAG);
-
 		strcpy(cp, prom_argv[i]);
 		cp += strlen(prom_argv[i]);
 	}
@@ -122,11 +117,6 @@ void __init prom_setup_cmdline(void)
 		strcpy(cp, arcs_cmdline);
 		cp += strlen(arcs_cmdline);
 	}
-	if (gpio_bootup_state & 0x02)
-		strcpy(cp, GPIO_INIT_NOBUTTON);
-	else
-		strcpy(cp, GPIO_INIT_BUTTON);
-
 	cmd_line[CL_SIZE-1] = '\0';
 
 	strcpy(arcs_cmdline, cmd_line);

include/asm-mips/mach-rc32434/prom.h

@@ -28,14 +28,10 @@
 
 #define PROM_ENTRY(x)		(0xbfc00000 + ((x) * 8))
 
-#define GPIO_INIT_NOBUTTON	""
-#define GPIO_INIT_BUTTON	" 2"
-
 #define SR_NMI			0x00180000
 #define SERIAL_SPEED_ENTRY	0x00000001
 
 #define FREQ_TAG		"HZ="
-#define GPIO_TAG		"gpio="
 #define KMAC_TAG		"kmac="
 #define MEM_TAG			"mem="
 #define BOARD_TAG		"board="