powerpc/kernel: Rename PACA_DSCR to PACA_DSCR_DEFAULT

PACA_DSCR offset macro tracks dscr_default element in the paca
structure. Better change the name of this macro to match that of the
data element it tracks. Makes the code more readable.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --cc arch/powerpc/kernel/asm-offsets.c
Simple merge

diff --cc arch/powerpc/kernel/entry_64.S
Simple merge

diff --cc arch/powerpc/kernel/tm.S
Simple merge

diff --cc arch/powerpc/kvm/book3s_hv_rmhandlers.S
Simple merge