Fix all remaining indentation issues in python code

I ran a script that shouldn't have missed any tab in the python source files.

litedram/phy/a7ddrphy.py

@@ -41,6 +41,7 @@ class A7DDRPHY(Module, AutoCSR):
         # # #
 
         # Clock
+        for i in range(len(pads.clk_p)):
             sd_clk_se = Signal()
             self.specials += [
                 Instance("OSERDESE2",
@@ -57,8 +58,8 @@ class A7DDRPHY(Module, AutoCSR):
                 ),
                 Instance("OBUFDS",
                     i_I=sd_clk_se,
-                o_O=pads.clk_p,
-                o_OB=pads.clk_n
+                    o_O=pads.clk_p[i],
+                    o_OB=pads.clk_n[i]
                 )
             ]