(cherry picked from commit 7e994302)

DVB: cx23885: SRAM changes for the 885 and 887 silicon parts

In a previous patch I merged both memory maps into a single struct,
believing that they could be combined. We've since found problems
with streaming multiple channels on the 885. I'm restoring the
multiple memory map structs - in line with the windows driver.
Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>