support .int data type

.long and .int are the same as per GNU assembler manual:
https://sourceware.org/binutils/docs/as/Long.html

binutils-esp32ulp also treats them the same (compat test included
to verify this)

Author: wnienhaus

Diff for: esp32_ulp/assemble.py

@@ -240,6 +240,11 @@ def d_word(self, *args):
         self.append_data(2, args)
 
     def d_long(self, *args):
+        self.d_int(*args)
+
+    def d_int(self, *args):
+        # .long and .int are identical as per GNU assembler documentation
+        # https://sourceware.org/binutils/docs/as/Long.html
         self.append_data(4, args)
 
     def assembler_pass(self, lines):

Diff for: tests/compat/fixes.S

@@ -12,6 +12,9 @@
 counter:
 .long 0
 
+.data
+var2: .int 1111
+
   .text
   .global entry
 entry: