How am I inferring latch in this code?

I think you want to be doing this under rising_edge:

		if RST_RSMRST_N_200MS_CNT = "1100100" then    								
			RST_RSMRST_N_200MS_DELAY <='1';
                        else RST_RSMRST_N_200MS_CNT <= RST_RSMRST_N_200MS_CNT + '1'; 
		end if;

Doing the count before checking the count value implies that there must already be a value in RST_RSMRST_N_200MS_CNT already to increment, causing the latch.

Or you could use a variable to temporarily store the count.

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