omap: Fix spotty MMC voltages

As noted by Michał Mirosław <mirqus@gmail.com>, the voltages should
cover the supported voltage range, or support only one voltage.

As all these boards are using a GPIO to enable the power, chances
are that only 3.3V cards are supported on these boards.

Reported-by: Michał Mirosław <mirqus@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/board-htcherald.c b/arch/arm/mach-omap1/board-htcherald.c
index 7ea75c1..88c97e2 100644
--- a/arch/arm/mach-omap1/board-htcherald.c
+++ b/arch/arm/mach-omap1/board-htcherald.c
@@ -410,8 +410,7 @@
 	.nr_slots                       = 1,
 	.switch_slot                    = NULL,
 	.slots[0]       = {
-		.ocr_mask               = MMC_VDD_28_29 | MMC_VDD_30_31 |
-					  MMC_VDD_32_33 | MMC_VDD_33_34,
+		.ocr_mask               = MMC_VDD_32_33 | MMC_VDD_33_34,
 		.name                   = "mmcblk",
 		.nomux                  = 1,
 		.wires                  = 4,