ARM: berlin: add MACH_BERLIN_BG2Q symbol
ARM: berlin: add MACH_BERLIN_BG2Q symbol

Now that we start supporting the Marvell Berlin BG2Q, add a symbol allowing to
differentiate that SoC from the other SoCs of the Berlin family.

Signed-off-by: Alexandre Belloni <a7228e626ecf0022ac91fc1cd8db88e71d0e5e0e@free-electrons.com>
Signed-off-by: Sebastian Hesselbarth <1d402fe89ace836b52164ed4c0f247cb6f80efc1@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs