ARM: Fix OMAP3 framebuffer divider setting

QEMU was crashing since when setting the DSS divider we were _clearing_
the TV divider, and QEMU did not check for a divide by zero.

This "fixes" the QEMU crash and gets us a working framebuffer on Beagle ;)

src/system/boot/arch/arm/arch_framebuffer_omap3.cpp

@@ -262,7 +262,7 @@ found:
 	setreg(DISPC, DISPC_TIMING_V, m->dispc_timing_v);
 
 	modreg(DISPC, DISPC_DIVISOR, 0xffff, m->dispc_divisor);
-	modaddr(CM_CLKSEL_DSS, 0xffff, m->dss_divisor);
+	modaddr(CM_CLKSEL_DSS, 0x3f, m->dss_divisor);
 
 	// Tell hardware to update, and wait for it
 	modreg(DISPC, DISPC_CONTROL,

src/system/boot/platform/u-boot/video.cpp

@@ -110,11 +110,7 @@ platform_init_video(void)
 		gFramebuffer = arch_get_fb_arm_920(0x88000000);
 	#elif defined(BOARD_CPU_OMAP3)
 		extern ArchFramebuffer *arch_get_fb_arm_omap3(addr_t base);
-		//FIXME: This is disabled because writing to CM_CLKSEL_DSS during the initialisation
-		//of the framebuffer driver on OMAP3 triggers a floating point exception
-		//(tested in qemu-linaro from git at commit ac0bfdb9c310276521e5b089d7f36c1f610ca60b)
-		//gFramebuffer = arch_get_fb_arm_omap3(FB_BASE);
-		gFramebuffer = NULL;
+		gFramebuffer = arch_get_fb_arm_omap3(FB_BASE);
 	#elif defined(BOARD_CPU_PXA270)
 		ArchFramebuffer *arch_get_fb_arm_pxa270(addr_t base);
 		gFramebuffer = arch_get_fb_arm_pxa270(0xA3000000);