net: ipa: add a parameter to aggregation registers

Starting with IPA v5.0, a single IPA instance can have more than 32
endpoints defined.  To handle this, each register that holds a
bitmap of IPA endpoints is replicated as needed to represent the
available endpoints.

To prepare for this, registers that represent endpoint IDs in a bit
mask will be defined to have a parameter, with a stride value of 4
bytes.  The first 32 endpoints are represented in the first 32-bit
register, then the next (up to) 32 endpoints at an offset 4 bytes
higher.  When accessing such a register, the endpoint ID divided
by 32 determines the offset, and the endpoint ID modulo 32 defines
the endpoint's bit position within the register.

The first two registers we'll update for this are STATE_AGGR_ACTIVE
and AGGR_FORCE_CLOSE.

Until more than 32 endpoints are supported, this change has no
practical effect.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>