msm: pcie: remove IO/MEM resource in PCIe root complex driver

PCIe root complex driver ioremaps IO and MEM resource but
does nothing with them. When MEM space is very large (ex: 1GB),
PCIe root bus driver fails to ioremap it. Therefore, remove
the ioremap of IO and MEM in PCIe root complex driver.

Change-Id: If333d2d785c9d36bc8156fe84f6671ba98de8ab3
Signed-off-by: Tony Truong <truong@codeaurora.org>