GPU OC: Changed 544MHz to 545MHz to conform better to the PLL table, added 627MHz frequency
GPU: available freqs: Add code for new freq step 627Mhz

Change-Id: Ia1866af32e7541a5d4187f0508ae38c64c0ba1eb
GPU: available freqs: adjust for 544 to 545mhz change

Change-Id: I4c0ada48361e295009484de8c801db707ed2c5d7