Update serial aliases from "ttyASN" to more common "serialN".
Since dtc 
v1.4.6-9-gaadd0b65c987, aliases property name must
be lowercase only. This allows to fix following dtc warnings:
arch/arm/boot/dts/stih418-b2199.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
arch/arm/boot/dts/stih407-b2120.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
arch/arm/boot/dts/stih410-b2260.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
arch/arm/boot/dts/stih410-b2120.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
        };
 
        aliases {
-               ttyAS0 = &sbc_serial0;
+               serial0 = &sbc_serial0;
                ethernet0 = ðernet0;
        };
 
 
        };
 
        aliases {
-               ttyAS0 = &sbc_serial0;
+               serial0 = &sbc_serial0;
                ethernet0 = ðernet0;
        };
 
 
        };
 
        aliases {
-               ttyAS1 = &uart1;
+               serial1 = &uart1;
                ethernet0 = ðernet0;
        };
 
 
        };
 
        aliases {
-               ttyAS0 = &sbc_serial0;
+               serial0 = &sbc_serial0;
                ethernet0 = ðernet0;
        };