[decode-syseeprom] fix getattribute check for sime platforms (sonic-n…

…et#835)

For some platforms which implement the eeprom plugin by inheriting from TlvInfoDecoder, the line

t.getattr('read_eeprom_db', None) == None:
results in an error:
AttributeError: 'board' object has no attribute 'getattr'

The cause for that is that TlvInfoDecoder inherits from object, and looks like for object and derived classes there is no __getattr__.

Signed-off-by: Mykola Faryma <mykolaf@mellanox.com>

scripts/decode-syseeprom

@@ -55,7 +55,7 @@ def main():
     # Currently, don't support eeprom db on Arista platform
     platforms_without_eeprom_db = ['arista', 'kvm']
     if any(platform in platform_path for platform in platforms_without_eeprom_db)\
-            or t.getattr('read_eeprom_db', None) == None:
+            or getattr(t, 'read_eeprom_db', None) == None:
         support_eeprom_db = False
 
     #