Change machine type from da8xx_evm to da830_evm

Change machine type from da8xx_evm to da830_evm.
With introduction of DA850 SoC from TI, having a name like da8xx is confusing.
Signed-off-by: Steve Chen <schen@mvista.com>

arch/arm/tools/mach-types

@@ -1769,7 +1769,7 @@ mx31cicada		MACH_MX31CICADA		MX31CICADA		1777
 mi424wr			MACH_MI424WR		MI424WR			1778
 axs_ultrax		MACH_AXS_ULTRAX		AXS_ULTRAX		1779
 at572d940deb		MACH_AT572D940DEB	AT572D940DEB		1780
-davinci_da8xx_evm	MACH_DAVINCI_DA8XX_EVM	DAVINCI_DA8XX_EVM	1781
+davinci_da830_evm	MACH_DAVINCI_DA830_EVM	DAVINCI_DA830_EVM	1781
 ep9302			MACH_EP9302		EP9302			1782
 at572d940hfek		MACH_AT572D940HFEB	AT572D940HFEB		1783
 cybook3			MACH_CYBOOK3		CYBOOK3			1784