pyramid: Switch to old mem-map style and remove cam heap

*Switched to old memory-map style (single memory bank @ 0x48000000)
*Removed ION camera heap (the ION camera heap is a legacy heap only used on MSM8660. The camera HAL I'm using from Flemmard is from an MSM8960 device, so it doesn't use the ION camera heap. Instead, it uses MM and IOMMU, but because we have no IOMMU, the HAL falls back to MM and uses MM for both camera preview and SMI)
*Userspace now has 620MB of RAM

Signed-off-by: Sultanxda <sultanxda@gmail.com>
Sultan_defconfig: Change kernel start address to 0x48000000

Signed-off-by: Sultanxda <sultanxda@gmail.com>