Set the eeprom cache permissions to 755

Issue and Root Cause:
The issue arises because, after a system reboot, the permissions of /var/cache/sonic/decode-syseeprom/ or its file
/var/cache/sonic/decode-syseeprom/syseeprom_cache may be incorrectly set. This misconfiguration can cause the
Platform API to require root privileges for access.

This problem has been observed in various platforms, such as the AS7326_56X, where running show platform syseeprom
results in errors due to permission issues.

Solution:
To address this, it's essential to ensure that the cache directory and its files have the correct permissions set upon
system startup. Implementing a fix that adjusts these permissions appropriately can prevent the Platform API from
requiring root privileges, thereby resolving the issue.

Author: PJHsieh

sonic_platform_base/sonic_eeprom/eeprom_base.py

@@ -295,9 +295,21 @@ def write_cache(self, e):
         if self.cache_name:
             F = None
             try:
+                # Ensure the directory exists
+                directory = os.path.dirname(self.cache_name)
+
+                if not os.path.exists(directory):
+                    os.makedirs(directory)
+
+                # Set directory permissions to 755
+                os.chmod(directory, 0o755)
+
                 F = open(self.cache_name, "wb")
                 F.seek(self.s)
                 F.write(e)
+
+                # Set file permissions to 755
+                os.chmod(self.cache_name, 0o755)
             except IOError as e:
                 raise IOError("Failed to write cache : %s" % (str(e)))
             finally: