ARM: OMAP2+: Fix build error after merge

Commit 9890ce44 (ARM: get rid of asm/irq.h in asm/prom.h)
removed include of asm/irq.h in asm/prom.h. This commit
together with recent omap cleanup to remove io.h causes
build breakage:

arrch/arm/mach-omap2/control.c: In function 'omap3_ctrl_write_boot_mode':
arch/arm/mach-omap2/control.c:238: error:
'OMAP343X_CTRL_BASE' undeclared (first use in this function)
...

Fix this by including hardware.h directly where needed
instead of relying on asm/irq.h in asm/prom.h.
Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/cm2xxx_3xxx.c

@@ -18,6 +18,8 @@
 #include <linux/err.h>
 #include <linux/io.h>
 
+#include <plat/hardware.h>
+
 #include "iomap.h"
 #include "common.h"
 #include "cm.h"

arch/arm/mach-omap2/common.c

@@ -17,6 +17,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 
+#include <plat/hardware.h>
 #include <plat/board.h>
 #include <plat/mux.h>
 #include <plat/clock.h>

arch/arm/mach-omap2/control.c

@@ -15,6 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/io.h>
 
+#include <plat/hardware.h>
 #include <plat/sdrc.h>
 
 #include "iomap.h"

arch/arm/mach-omap2/sdrc2xxx.c

@@ -24,6 +24,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 
+#include <plat/hardware.h>
 #include <plat/clock.h>
 #include <plat/sram.h>
 #include <plat/sdrc.h>