ARC: [axs101] support early 8250 uart

Earlycon calculates UART clock as "BASE_BAUD * 16". In case of ARC
"BASE_BAUD" is calculated dynamically in runtime, basically it is an
alias to arc_early_base_baud(), which in turn just does
"arc_base_baud/16".

8250 UART on AXS/SDP board uses 33.3MHz clock source which is set in
"arc_base_baud" with this change.

Additional compatibility string "snps,arc-sdp" is introduced as well
because there're different flavours of AXS boards but they all share the
same motherboard and so it's possible to re-use the same code for
motherbord even if CPU daughterboard changes.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/kernel/devtree.c

@@ -32,6 +32,8 @@ static void __init arc_set_early_base_baud(unsigned long dt_root)
 
 	if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))
 		arc_base_baud = core_clk/3;
+	else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp"))
+		arc_base_baud = 33333333;	/* Fixed 33MHz clk */
 	else
 		arc_base_baud = core_clk;
 }