peripherals/i2c: don't disable master mode in configure_slave

target/ast10x0/peripherals/i2c/slave.rs

diff --git a/target/ast10x0/peripherals/i2c/slave.rs b/target/ast10x0/peripherals/i2c/slave.rs
index 360e988..b603df6 100644
--- a/target/ast10x0/peripherals/i2c/slave.rs
+++ b/target/ast10x0/peripherals/i2c/slave.rs
@@ -174,11 +174,6 @@
 
     /// Configure the controller for slave mode
     pub fn configure_slave(&mut self, config: &SlaveConfig) -> Result<(), I2cError> {
-        // Ensure master mode is disabled first
-        self.regs()
-            .i2cc00()
-            .modify(|_, w| w.enbl_master_fn().clear_bit());
-
         // Set slave address
         self.regs().i2cs40().write(|w| unsafe {
             w.slave_dev_addr1()