powerpc: Remove duplicate SPRN_HSRR definitions

There are two copies of these defines. Keep the older ones as they have
associated bit definitions.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230405045316.95003-1-joel@jms.id.au