omap: update uboot to 2019.10

omap: update uboot to 2019.10

All patches have been dropped, they're either redundant (e.g. due to the
new and unset CONFIG_SPL_FAT_WRITE), break compilation (thumb hacks) or
have been applied upstream.

The defconfig for am335x_boneblack has been removed upstream [0], so use
am335x_evm for boneblack too.

Size changes (before, after, file):

ti_am335x-evm and ti_am335x-bone-black:
  79804 110832 MLO
 623836 756148 u-boot.img

ti_omap3-beagle:
  54148  57708 MLO
 496272 665728 u-boot.img

ti_omap4-panda:
  39356  40204 MLO
 284648 366672 u-boot.img

Tested on boneblack, which has the biggest spl size increase. The beagle and
panda spl sizes seem reasonable to not break booting.

[0] https://gitlab.denx.de/u-boot/u-boot/commit/8fa7f65dd02c176ee6021eaf40114560b8954ba2

Signed-off-by: Andre Heider <a.heider@gmail.com>