rtl8224: wait for the PHY to answer instead of a fixed 2.5 s

rtl8224_enable() waits 2.5 s after releasing the RTL8224 reset before
anything talks to the PHY. On an SWTGW218AS the chip id already reads
back 0x8224 at the first poll, about 265 ms after the release.

Remember when the reset was released and, once SMI is up, poll the chip
id until it answers, giving up after the same 2.5 s as before. The PHY
writes that follow read back the same as before.

The reset pulse before it goes from 0.5 s to 20 ms, twice the 10 ms the
related RTL8372 and RTL8221B need. The pulse does reset the chip: the
MDI reverse register (MMD 30, 0x0a90) still reads its power-on value
0x00f3 just before the init writes 0x00fc, as it does with 0.5 s.
Together the console banner comes 3 s sooner.

The SerDes write loop in phy_config_8224() waited on the busy bit with
no limit, so a PHY that never answers stopped the boot before the
network came up. Bound it and report a timeout.

rtlplayground.c

@@ -1701,6 +1701,8 @@ void main(void)
 
 	REG_SET(RTL837X_PIN_MUX_2, 0x0); // Disable pins for ACL
 	init_smi();
+	if (machine_detected.isRTL8373)
+		rtl8224_wait_ready();
 
 	rtl8373_revision();