LP64 fixes for media/libeffects

Changes include:

[x] In get parameter series of functions, replaced size_t*
    formal parameter type with uint32_t* where actual parameter
    passed was uint32_t*.

[x] In set parameter series of functions, changed size_t
    formal parameter to uint32_t where actual parameter was
    uint32_t.

[x] Changed the definition of LVM_UINT32 from unsigned
    long to uint32_t as unsigned long is 64-bit in LP64.

[x] Used other stdint.h types for other LVM_types for
    consistency.

[x] Use of uintptr_t for the pNextMember of the INST_ALLOC
    structure, rather than LVM_UINT32, for portablility.

[x] Use of uintptr_t where pointers are used in arithmetic.

[x] Replaced the use of 0xFFFFFFFC with ~3 in places where
    it was used to clear last two bits.

[x] Removed int casts where cmdSize and *replySize, both
    uint32_t, were being compared with sizeof().

Change-Id: Ibec0b4d8e9b855f44b1cd853be6df84d13cf4186
Signed-off-by: Marcus Oakland <marcus.oakland@arm.com>
Signed-off-by: Ashok Bhat <ashok.bhat@arm.com>