This converts the following to Kconfig:
   CONFIG_SYS_DV_CLKMODE
   CONFIG_SYS_DA850_PLL0_POSTDIV
   CONFIG_SYS_DA850_PLL0_PLLDIV1
   CONFIG_SYS_DA850_PLL0_PLLDIV2
   CONFIG_SYS_DA850_PLL0_PLLDIV3
   CONFIG_SYS_DA850_PLL0_PLLDIV4
   CONFIG_SYS_DA850_PLL0_PLLDIV5
   CONFIG_SYS_DA850_PLL0_PLLDIV6
   CONFIG_SYS_DA850_PLL0_PLLDIV7
   CONFIG_SYS_DA850_PLL1_POSTDIV
   CONFIG_SYS_DA850_PLL1_PLLDIV1
   CONFIG_SYS_DA850_PLL1_PLLDIV2
   CONFIG_SYS_DA850_PLL1_PLLDIV3
Signed-off-by: NAdam Ford <aford173@gmail.com>