Switch to jethro branch (2.0)
Switch to jethro branch (2.0)

Switch to using jethro branch instead of daisy branch. There is
nothing specific for Yocto/OE branch used in our recipes, so for
now only README is changed to show clearly that we are using jethro
now.

Signed-off-by: Guillaume Tucker <e7e20b7c30f19d4ca6b81319ef81bf200369d137@arm.com>

ARM-software/meta-mali,ARM-software/meta-mali,ARM-software/meta-mali