epiphany: Pin __pal_global struct to core local SRAM
epiphany: Pin __pal_global struct to core local SRAM

Assumes there's a .data_bank0 section in linker script.

Signed-off-by: Ola Jeppsson <793f970c52ded1276b9264c742f19d1888cbaf73@adapteva.com>

mateunho/pal,mateunho/pal,aolofsson/pal,parallella/pal,aolofsson/pal,mateunho/pal,eliteraspberries/pal,aolofsson/pal,parallella/pal,eliteraspberries/pal,mateunho/pal,eliteraspberries/pal,parallella/pal,eliteraspberries/pal,eliteraspberries/pal,mateunho/pal,parallella/pal,parallella/pal,aolofsson/pal