DM_DEBUG is incompatible with "=> dm tree"

[mcerveny]

u-boot command => dm tree fails with assert() for every additionally bonded driver like device_bind_driver()/"psci-sysreset" or blk_create_device()/"rkflash_blk" .. assert() was enabled with DM_DEBUG.

=> dm tree
 Addr        Class      Probed    Driver                   Name
-------------------------------------------------------------------------
 7df18288    root       [ + ]   root_driver                ofnode_read_bool: u-boot,dm-pre-reloc: false
ofnode_read_bool: u-boot,dm-spl: false
root_driver 
 7df18318    firmware   [   ]   psci                       |-- ofnode_read_bool: u-boot,dm-pre-reloc: true
psci **
 7df18398    sysreset   [   ]   psci-sysreset              |   `-- drivers/core/ofnode.c:79: ofnode_read_bool: Assertion `ofnode_valid(node)' failed.
### ERROR ### Please RESET the board ###

=> dm tree
 Addr        Class      Probed    Driver                   Name
-------------------------------------------------------------------------
 7df18288    root       [ + ]   root_driver                ofnode_read_bool: u-boot,dm-pre-reloc: false
 ofnode_read_bool: u-boot,dm-spl: false
root_driver 
 7df18318    firmware   [   ]   psci                       |-- ofnode_read_bool: u-boot,dm-pre-reloc: true
psci **
 7df18398    clk        [ + ]   fixed_rate_clock           |-- ofnode_read_bool: u-boot,dm-pre-reloc: false
 ofnode_read_bool: u-boot,dm-spl: false
xin24m 
 7df18408    clk        [ + ]   fixed_rate_clock           |-- ofnode_read_bool: u-boot,dm-pre-reloc: false
 ofnode_read_bool: u-boot,dm-spl: false
xin12m 
 7df18498    rksfc      [   ]   rksfc                      |-- ofnode_read_bool: u-boot,dm-pre-reloc: true
sfc@1020c000 **
 7df18538    blk        [   ]   rkflash_blk                |   |-- drivers/core/ofnode.c:79: ofnode_read_bool: Assertion `ofnode_valid(node)' failed.
### ERROR ### Please RESET the board ###